<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.16.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
    </dependencies>

public class Log {
    public void before(){
        System.out.println("aop before");
    }
}

 <bean id="hello" class="org.spring.Hello"></bean>
    <bean id="log" class="org.spring.Log"></bean>
    <aop:config>
        <aop:aspect id="log" ref="log">
            <aop:before method="before" pointcut="execution(public void org.spring.Hello.aop())"></aop:before>
        </aop:aspect>
    </aop:config>

解释
每次执行Hello类中的aop方法都会触发切面Log类中的before方法先执行

@Pointcut("execution(* com.cjm.model..*.*(..))")

切面方法

package org.spring;

public class Log {
    public void before(){
        System.out.println("aop before");
    }
    public void after(){
        System.out.println("aop after");
    }
    public void exp(){
        System.out.println("aop ex");
    }
    public void fina(){
        System.out.println("aop fina");
    }

}

<aop:aspect id="log" ref="log">
            <aop:before method="before" pointcut="execution(public void org.spring.Hello.aop())"></aop:before>
            <aop:after-returning method="after" pointcut="execution(public void org.spring.Hello.*(..))"></aop:after-returning>
            <aop:after-throwing method="exp" pointcut="execution(public void org.spring.Hello.*(..))"></aop:after-throwing>
            <aop:after method="fina" pointcut="execution(public void org.spring.Hello.*(..))"></aop:after>
        </aop:aspect>